Update codechecker to 6.26.1

[artemgavrilov]

Codechecker was updated on server side, so we have to update it in CI as well.

Test workflow run: https://github.com/percona/postgres/actions/runs/17446631286/job/49632658600
Test report: https://codechecker.percona.com/pg_tde/reports?review-status=Unreviewed&review-status=Confirmed%20bug&detection-status=New&detection-status=Reopened&detection-status=Unresolved&run=575%2Fmerge

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.20%. Comparing base (d0b53f3) to head (65d8348).
⚠️ Report is 2 commits behind head on TDE_REL_17_STABLE.

❌ Your project status has failed because the head coverage (84.20%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                Coverage Diff                 @@
##           TDE_REL_17_STABLE     #575   +/-   ##
==================================================
  Coverage              84.20%   84.20%           
==================================================
  Files                     25       25           
  Lines                   3247     3247           
  Branches                 511      511           
==================================================
  Hits                    2734     2734           
  Misses                   400      400           
  Partials                 113      113           

Components	Coverage Δ
access	84.72% <ø> (ø)
catalog	87.65% <ø> (ø)
common	77.77% <ø> (ø)
encryption	72.97% <ø> (ø)
keyring	73.21% <ø> (ø)
src	94.18% <ø> (ø)
smgr	96.53% <ø> (ø)
transam	∅ <ø> (∅)

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